JP2007283286A - Method for manufacturing plugged honeycomb structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a sealed honeycomb structure, which makes it possible to provide a uniform sealing depth for a honeycomb structure and produce such a sealed honeycomb structure conveniently at low cost. <P>SOLUTION: All cells 42 of a honeycomb structure 41 are filled with a slurry sealing agent 43. Separately, an image of the end face cells of the honeycomb structure 41 is taken with a camera 40. A light-cured or thermosetting resin film 44 is applied onto the end face of the honeycomb structure 41 with all cells sealed and then a sealing pattern is printed on the film 44. After printing, the honeycomb structure 41 to which the film 44a is applied is exposed to light or heat using a light source or heat source 50. Thus, only target membrane portions 45 are cured. Uncured membrane portions 48 and uncured cell portions 47 are removed together with a sealing material 49 by the use of pressurized air and a sandblast Y. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a plugged honeycomb structure. Furthermore, when used in a filter or the like, the production of a plugged honeycomb structure capable of producing a plugged honeycomb structure with reduced deposit accumulation on its end face easily and at low cost Regarding the method. More specifically, the present invention relates to a method for manufacturing a plugged honeycomb structure capable of easily uniformizing the plugging depth of the honeycomb structure.

  In recent years, in various fields including chemical, electric power, steel, and industrial waste treatment, as a filter for dust collection used for environmental measures such as pollution prevention, product recovery from high temperature gas, etc., heat resistance, A plugged honeycomb structure made of ceramic having excellent corrosion resistance is used. For example, such a plugged honeycomb structure is used as a dust collection filter used in a high temperature, corrosive gas atmosphere such as a diesel particulate filter (DPF) that collects particulates discharged from a diesel engine. It is used suitably (for example, patent document 1).

  As shown in FIG. 7, the plugged honeycomb structure used as a dust collecting filter as described above has a cylindrical shape having porous partition walls 22 that define a plurality of cells 24 that serve as fluid flow paths. A honeycomb structure 23 and a plugging member 26 that plugs one opening of a predetermined cell and plugs the other opening of the remaining cells are provided. In the plugged honeycomb structure 21 shown in FIG. 7, the plugging members 26 plug the inlet side end surfaces B and the outlet side end surfaces C of the plurality of cells 24 alternately.

  The plugged honeycomb structure 21 as described above is obtained by obtaining a cylindrical unfired honeycomb structure having porous partition walls that define a plurality of cells serving as fluid flow paths by extrusion molding. A plugging slurry containing ceramic is formed in one opening of a predetermined cell of the obtained unfired honeycomb structure or the honeycomb structure obtained by firing the unfired honeycomb structure and the other opening of the remaining cells. It can manufacture by baking after filling.

  Furthermore, the conventional manufacturing method of the plugged honeycomb structure used as a filter for dust collection as described above is shown in FIGS. As shown in FIG. 6A, for example, the film 2 is adhered to one end face of the honeycomb formed body 1 which is an unfired ceramic dried body, and the eyes of the film 2 are obtained by laser processing using image processing or the like. The honeycomb molded body 1 to which the mask 4 is adhered as shown in FIG. 6B is formed by making holes only in the portions 3 corresponding to the cells to be sealed (plugged cells). The end face is immersed in a slurry (ceramic slurry) 5 and the plugging cells of the honeycomb formed body 1 are filled with the slurry 5 to form plugged portions. The same process is performed on the other side of the honeycomb formed body 1. There has been proposed a method of obtaining a plugged honeycomb structure by performing drying on the end face, followed by firing and firing (for example, Patent Document 2).

Japanese Patent Laid-Open No. 2001-300922 JP 2005-270755 A

  In the method of manufacturing the plugged honeycomb structure as described above, the hole is likely to be smaller than the cell opening in the method of laser drilling in the film, so the plugging material is used when filling the plugging material into the cell. May not be able to enter the cell. In addition, in the incomplete cells in the outer peripheral portion of the honeycomb structure, it is necessary to reduce the hole diameter, and it is necessary to change the laser irradiation conditions, and there is a problem that the drilling is complicated.

  The present inventor has a problem that the plugging material is difficult to enter into the cell when filling the plugging material into the cell by making the hole substantially the same as the cell-shaped cell opening, and easy opening of the hole. The present invention has been achieved with the object of providing a manufacturing method that solves the problem of achieving the above.

  In order to achieve the above object, the present invention provides the following method for manufacturing a plugged honeycomb structure.

[1] A plug in which a plugged portion is formed at one open end of a predetermined cell of a tubular honeycomb structure in which a plurality of cells serving as fluid flow paths are formed in a honeycomb shape by porous partition walls In the manufacturing method of the sealed honeycomb structure, the end face of the honeycomb structure is imaged in advance, and then a predetermined plugging pattern is synthesized by image processing on the end face cell group of the captured honeycomb structure end face. After the printed composite image is printed on the light or thermosetting resin film formed on the end surface of the honeycomb structure, the light or heat is irradiated to the end surface of the honeycomb structure, and the cured portion is removed to remove the light or the heat. A plugged honeycomb, wherein an opening having a predetermined plugging pattern is formed in a thermosetting resin film, and a plugging material is filled into cells of the honeycomb structure to form a plugged portion. Manufacturing method of structure.

[2] The method for manufacturing a plugged honeycomb structure according to [1], wherein a plugged pattern synthesized in advance on a light or thermosetting resin film is printed, and the film is attached to an end face of the honeycomb structure.

[3] A plug having a plugged portion formed at one open end of a predetermined cell of a tubular honeycomb structure in which a plurality of cells serving as fluid flow paths are formed in a honeycomb shape by porous partition walls In the manufacturing method of the sealed honeycomb structure, after all the cells on the end face of the honeycomb structure are filled with a plugging material in advance, a light or thermosetting resin film is formed on the end face, and the end face of the honeycomb structure is previously imaged. Then, a predetermined plugging pattern is synthesized by image processing on the end face cell group of the end face of the honeycomb structure imaged, and the obtained composite image is light or thermosetting resin formed on the end face of the honeycomb structure body After printing on the membrane, the end surface of the honeycomb structure is irradiated with light or heat to cure the light or thermosetting resin film of a predetermined cell, and the uncured light or thermosetting resin film is removed together with the plugging material. After cured light or thermoset resin film Method for manufacturing a plugged honeycomb structure and forming plugging portions by removing.

[4] A plug having a plugged portion formed at one open end of a predetermined cell of a tubular honeycomb structure in which a plurality of cells serving as fluid flow paths are formed in a honeycomb shape by porous partition walls In a method for manufacturing a sealed honeycomb structure, a honeycomb structure in which light or thermosetting resin is previously contained in the plugging material, the cells are filled in all the cells of the honeycomb structure, and the honeycomb structure is imaged in advance. Based on the end face image information, the end face is irradiated with a laser in a plugging pattern so that the plugging material of a predetermined cell is cured and the plugging material that has not been cured is removed. A method for manufacturing a plugged honeycomb structure, wherein a portion is formed.

[5] A plug having a plugged portion formed at one open end of a predetermined cell of a tubular honeycomb structure in which a plurality of cells serving as fluid flow paths are formed in a honeycomb shape by porous partition walls In the method for manufacturing a sealed honeycomb structure, after all the cells on the end face of the honeycomb structure are filled with a plugging material in advance, a light or thermosetting resin film is formed on the end face, and then the honeycomb structure is imaged in advance. By irradiating the end face with a laser in a plugging pattern based on the end face image information, the light or thermosetting resin film of a predetermined cell is cured and the uncured light or thermosetting resin film is plugged. A method for manufacturing a plugged honeycomb structure, wherein the plugged portion is formed by removing the cured light or thermosetting resin film after removing together with the material.

  The production method of the present invention has the following effects. That is, since a hole is made in the film along the plugging pattern printed on the film based on the cell shape of the imaged end face, the hole can be made substantially the same as the cell opening. Therefore, the problem that the plugging material easily enters the cell and the plugging material hardly enters the cell when the plugging material is filled into the cell is solved. In addition, the incomplete cells on the outermost periphery of the honeycomb structure can be processed with holes substantially the same as the cell openings, so that the problem of simplifying the drilling is also solved. Further, after filling the plugging material in all cells on the end face of the honeycomb structure in advance, a light or thermosetting resin film is formed on the end face, or a plugging material containing light or thermosetting resin is filled. In another embodiment of the present invention in which only the portion of the cell to be sealed is cured, not only is the solution of the problem that the plugging material hardly enters the cell when filling the plugging material into the cell, Since the uncured resin can be easily removed, the problem of simplifying drilling is also solved.

  Hereinafter, embodiments of the method for manufacturing a plugged honeycomb structure of the present invention will be described in detail with reference to the specific embodiments of the present invention shown in FIGS. 1 to 5, but the present invention is not limited thereto. However, various changes, modifications, and improvements can be made based on the knowledge of those skilled in the art without departing from the scope of the present invention.

  As the plugging member used in the present invention, a ceramic powder, for example, a cordierite powder added with a binder or a dispersion medium and kneaded can be suitably used as a plugging material. For example, a plugging member can be prepared by adding water, a binder, and glycerin to cordierite powder.

  The material of the honeycomb structure of the present invention is selected from the group consisting of cordierite, silicon carbide, alumina, mullite, aluminum titanate, and LAS (lithium aluminum silicate) from the viewpoint of strength, heat resistance, and the like. It is preferable to use one of these as the main crystal phase. If the plugging material slurry is the same as that of the honeycomb structure, the thermal expansion coefficients of the two are the same.

  A tubular honeycomb structure in which a plurality of cells serving as fluid flow paths are formed in a honeycomb shape by porous partition walls is manufactured, for example, by the method described in Patent Document 2. For example, a cylindrical unfired honeycomb structure having porous partition walls that form a plurality of cells serving as fluid flow paths can be obtained by extruding a forming raw material containing ceramic. The molding raw material containing ceramic is preferably a ceramic powder such as cordierite, mullite, alumina, spinel, silicon carbide, silicon nitride, lithium aluminum silicate, aluminum titanate, etc., kneaded with a binder or dispersion medium added. Can be used. Although there is no restriction | limiting in particular as a method of extrusion molding, For example, conventionally well-known methods, such as extrusion molding using a vacuum extrusion molding machine, can be used.

Fig.1 (a)-(e) demonstrates the printing process to the film of the honeycomb structure end surface in this invention. In this embodiment, as shown in FIG. 1A, first, a cell image of the end face of the honeycomb structure 11 is captured by the camera 18 to obtain a cell image 14 as shown in FIG. Next, a predetermined plugging pattern is synthesized with the obtained cell image 14 by image processing to obtain a synthesized image 15 as shown in FIG. On the other hand, as shown in FIG. 1 (d), a light or thermosetting resin film (film) 16 is pasted on the end face of the honeycomb structure 11, and the synthesis obtained above as shown in FIG. 1 (e). The image 15 is printed on the light or thermosetting resin film (film) 16 to obtain a printed film 17.

  In the present invention, the photocurable resin means a resin that is cured by ultraviolet light or visible light. For example, the resin-lighted portion is polymerized and cured by pulsed laser light, He—Cd laser light, or argon laser light, and an epoxy-based material is preferred because of its versatility.

  Further, the thermosetting resin refers to a liquid or powdery low molecular weight or thermoplastic polymer having a property of causing a cross-linking reaction between molecules by heating or the like to change into an insoluble polymer having a three-dimensional network structure. . For example, urea resin, melamine resin, phenol resin, epoxy resin, unsaturated polyester resin, acrylic resin, and the like, these resins have chemically reactive functional groups in the molecule.

The plugging pattern may be printed by printing light-absorbing ink or heat-absorbing ink on the light or thermosetting resin film, or printing light or thermosetting resin on the support film. The support film on which the light or thermosetting resin is printed can be a polyethylene film, a polypropylene film, or a polyester film. These films can be used after surface treatment in advance. In particular, for inkjet printing, for example, it is preferable to treat with a polyacryl powder, an unsaturated polyester powder, or the like. Corona discharge treatment can be used in combination with the surface treatment.

  Next, based on FIGS. 2A to 2D, the honeycomb structure having the printed film obtained in FIGS. 1A to 1E on the end face is cured by light or heat irradiation, and sealed. Each step of fixing the stopper will be described. As shown in FIG. 2B, the honeycomb structure 31 with the printed film 32 attached thereto is irradiated with light or heat using a light source such as ultraviolet rays or a heat source 37 such as a halogen lamp. As in (c), only the film 33 at the target location is cured. The cured film 33 of the cell portion 34 is fixed on the end face of the honeycomb structure 31. On the other hand, in the cell portion 35 that has not been cured, as shown in FIGS. 2C and 2D, the film 36 at a location that has not been cured by the pressurized air or sandblast Y is removed. In the next step, the cured film 33 may be removed after filling the plugging members into the cells by a conventionally known method, or may be eliminated by firing the honeycomb structure. In this manner, a plugged honeycomb structure with an end face plugged in a desired pattern is manufactured.

  Next, another embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 3A, first, the slurry-like plugging material 43 is filled into all the cells 42 of the honeycomb structure 41. Separately from this, as shown in FIG. 3B, an image of the end face cell of the honeycomb structure 41 is taken by the camera 40. Next, as shown in FIG. 3C, a light or thermosetting resin film (film) 44 is attached to the end face of the honeycomb structure 41 in which all the cells are sealed. Thereafter, in the same manner as in FIGS. 2A to 2D, as shown in FIG. 3D, a honeycomb structure in which a printed pattern 44 a is pasted after a plugging pattern is printed on the film 44. By irradiating light or heat to 41 using a light source or heat source 50 as shown in FIG. 3E, only the film 45 at the target location is cured as shown in FIG. The cured film 45 of the cell portion 46 is fixed at the end face of the honeycomb structure 41. On the other hand, in the uncured cell portion 47, as shown in FIG. 3G, the film 48 at a portion that has not been cured by pressurized air, sandblast Y, or the like is removed together with the plugging material 49. Note that the cured film 45 on the remaining end face may be removed by ordinary means or may be eliminated by firing.

  Still another embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 4A, the plugging material 52 contains light or a thermosetting resin in advance, and the plugging material 52 is filled in all the cells of the honeycomb structure 51. Next, as shown in FIG. 4B, based on the end face image information of the honeycomb structure 51 imaged in advance, the end face filled with the plugging material 52 of the honeycomb structure 51 is plugged in a pattern ( For example, as shown in FIG. 4C, the surface portion 54 of the plugging material 52 of the predetermined cell 53 is cured by irradiating the laser X in a zigzag manner, and the cured surface portion 54 is a honeycomb structure. 51 is fixed at the end face. On the other hand, as shown in FIGS. 4C and 4D, the plugging material 56 of the uncured cell portion 55 is removed by sandblast Y or the like.

  Furthermore, another embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 5A, the plugging material 62 is filled in all the cells on the end face of the honeycomb structure 61 in advance. Next, as shown in FIG. 5B, a light or thermosetting resin film 63 is formed on the end face filled with the plugging material 62. Next, as shown in FIG. 5C, based on the end face image information of the honeycomb structure 61 imaged in advance, the end face on which the light or thermosetting resin film 63 of the honeycomb structure 61 is formed is plugged. As shown in FIG. 5D, the film 65 of the predetermined cell 64 is cured by irradiating the laser X in the shape (for example, zigzag), and the cured film 65 is fixed on the end face of the honeycomb structure 61. The On the other hand, as shown in FIGS. 5D and 5E, the uncured film 67 of the cell portion 66 is removed together with the plugging material 68 by sandblasting Y or the like.

  Note that the formation of the light or heat effect film 63 may be either film sticking to the end face or application of light or heat effect resin. Further, the cured film 65 may be removed by ordinary means, or may be lost by firing.

  In the method for manufacturing a plugged honeycomb structure of the present embodiment, a catalyst is supported on the inner surface of the partition wall and / or inside the plugged honeycomb structure obtained by the above-described method. You may let them. For example, when a plugged honeycomb structure is used as the DPF, it is preferable to support a catalyst having a function of promoting the combustion of deposits (particulate matter) trapped in the partition walls. Preferred examples of such a catalyst include noble metal-based Pt, Pd, Rh and the like, and non-metallic perovskite-type catalysts. The method for supporting the catalyst can be performed according to the conventional method for supporting the catalyst on a filter such as DPF.

Hereinafter, based on an Example, it demonstrates further more concretely.
Example 1
For example, as a raw material, water, a binder, a surfactant, etc. are mixed with the above-mentioned cordierite-forming raw material mainly composed of talc, kaolin, and alumina, and the forming raw material is dispersed, mixed, and kneaded. A cylindrical cell (honeycomb) molded body having a partition wall which is formed by extruding into a plurality of cells and partitioning a plurality of cells serving as fluid flow paths by an extrusion molding machine, and an outer wall formed integrally with the partition wall Get. In the case of manufacturing a honeycomb structure using the formed body thus obtained, the obtained formed body is dried and cut into a predetermined length to obtain a dried body, and the cell groups on both ends of the dried body are alternately arranged. After the plugging, firing is performed to obtain a fired body. In the case of filling the plugging material in the cell, it is preferable to apply vibration to the plugging material so that the filling becomes easier and the plugging depth becomes uniform. Next, after grinding and removing about 1 to 3 cells of partition walls from the outer peripheral wall and outermost periphery of the obtained fired body, a ceramic coating material is applied to the outer periphery to form an outer peripheral wall. A honeycomb structure can be obtained.

Specifically, the cross-sectional shape of the cell is a quadrangle, the partition wall thickness is 0.3 mm, the reference cell density is 300 cpsi (46.5 cells / cm ² ), and the outer shape of the honeycomb structure after outer periphery coating is cylindrical (outer diameter) 191 mm, length: 203 mm), and a honeycomb structure having a plugging depth of 10 mm could be manufactured. Similarly, the cross-sectional shape of the cell is quadrangular, the partition wall thickness is 0.3 mm, the reference cell density is 200 cpsi (31 cells / cm ² ), and the outer shape of the honeycomb structure after outer periphery coating is cylindrical (outer diameter: 330 mm, long The thickness of the honeycomb structure was 305 mm) and the outer shape of the honeycomb structure after the outer periphery coating was cylindrical (outer diameter: 460 mm, length: 500 mm).

These cell structures have a porosity range of 40 to 80%, an average pore size range of 5 to 50 μm, and an average average thermal expansion coefficient range in the axial direction at 40 to 800 ° C. of about 0.1 to 2.0 ×. 10 ⁻⁶ / ° C.

In addition, using the same raw material, the cell cross-sectional shape is a combination of octagon and square, the partition wall thickness is 0.41 mm, and the reference cell density is 300 cpsi (46.5 cells / cm ² ) from 191 mm to 460 mm in outer diameter. A honeycomb structure having the following dimensions was manufactured. Furthermore, the outer shape of the integral molding that is not processed on the outer periphery is a cylindrical shape (outer diameter: 144 mm, length: 152 mm), the cell cross-sectional shape is a combination of octagon and square, the partition wall thickness is 0.41 mm, the reference A cell structure having a cell density of 300 cpsi (46.5 cells / cm ² ), a plugging depth of 3 mm, a cell cross-sectional shape of a square, a partition wall thickness of 0.43 mm, and a reference cell density of 100 cpsi (15.5 cells) / Cm ² ) to produce a cell structure having the same dimensions and plugging depth.

  In the outer peripheral coat type honeycomb structure in which the outer peripheral portion is processed and removed after plugging and the outer wall is formed by applying a ceramic coat, it is not always necessary to plug the partial cells located at the outermost peripheral portion of the honeycomb structure. However, in the honeycomb structure of the outer wall integral molding type, it is preferable in terms of filter performance to plug the partial cells to be plugged located on the outermost periphery and not plug the other cells. In this method, since the partial cells are also faithfully imaged and a plugging pattern is formed, in the honeycomb structure of the outer wall integral molding type, the partial cells to be plugged located on the outermost periphery are plugged. It becomes possible not to plug the cells that are not.

  The plugged honeycomb structure obtained by the manufacturing method according to the present invention is used in various fields including chemical, electric power, steel, industrial waste treatment, environmental measures such as pollution prevention, and product recovery from high-temperature gas. Filters for dust collection used in applications such as diesel filters, especially diesel particulate filters (DPF) that collect particulates discharged from diesel engines, etc., dust collection filters used in high-temperature, corrosive gas atmospheres Is preferably used.

(A)-(e) is process drawing which shows the printing process to the film of a honeycomb structure end surface among one Embodiment of this invention. (A)-(d) is each process of hardening by light or heat irradiation with respect to a honeycomb structure, fixing of a plugging material following FIG.1 (a)-(e) among one Embodiment of this invention. FIG. (A)-(g) is process drawing which shows another embodiment of this invention. (A)-(d) is process drawing which shows another embodiment of this invention. (A)-(e) is process drawing which shows another embodiment of this invention. (A) (b) is process drawing which shows the conventional manufacturing method of a plugged honeycomb structure. It is sectional drawing which shows the structure of a plugged honeycomb structure.

Explanation of symbols

1: honeycomb formed body, 2: film, 3: part corresponding to plugged cell, 4: mask, 5: slurry, 11: honeycomb structure, 14: cell image, 15: composite image, 16: light or heat Cured resin film (film), 17: printed film, 18: camera, 21: plugged honeycomb structure, 22: porous partition wall, 23: honeycomb structure, 24: cell, 26: plugging member, B: Cell end side end surface, C: Cell end side end surface, 31: Honeycomb structure, 32: Printed film, 33: Cured film, 34: Cell part, 35: Cell part, 36: Cured No film, 37: Light source or heat source, 40: Camera, 41: Honeycomb structure, 42: All cells, 43: Slurry plugging material, 44: Light or thermosetting resin film (film), 44a: Printing Finished film, 45: , 46: cured cell part, 47: uncured cell part, 48: uncured film, 49: plugging material, 50: light source or heat source, 61: honeycomb structure, 62: eye Sealing material, 63: light or thermosetting resin film, 64: predetermined cell, 65: film, 66: uncured cell part, 67: film, 68: plugging material, X: laser, Y: sandblast .

Claims (5)

A plugged honeycomb in which a plugged portion is formed at one open end of a predetermined cell of a tubular honeycomb structure in which a plurality of cells serving as fluid flow paths are formed in a honeycomb shape by porous partition walls In the manufacturing method of the structure,
The end face of the honeycomb structure is imaged in advance, and then a predetermined plugging pattern is synthesized by image processing on the end face cell group of the end face of the honeycomb structure that has been imaged, and the resultant composite image is formed on the end face of the honeycomb structure. After printing on the formed light or thermosetting resin film, the end face of the honeycomb structure is irradiated with light or heat, and the cured part is removed leaving a predetermined plugging on the light or thermosetting resin film A method for manufacturing a plugged honeycomb structure, comprising forming an opening having a pattern and filling a plugging material into cells of the honeycomb structure to form a plugged portion.   The method for manufacturing a plugged honeycomb structure according to claim 1, wherein a plugged pattern synthesized in advance on a light or thermosetting resin film is printed, and the film is attached to an end face of the honeycomb structure. A plugged honeycomb in which a plugged portion is formed at one open end of a predetermined cell of a cylindrical honeycomb structure in which a plurality of cells serving as fluid flow paths are formed in a honeycomb shape by porous partition walls In the manufacturing method of the structure,
After all the cells on the end face of the honeycomb structure are filled with a plugging material, a light or thermosetting resin film is formed on the end face, the end face of the honeycomb structure is imaged in advance, and then a predetermined plugging is formed. The stop pattern is combined with the end face cell group of the end face of the honeycomb structure imaged by image processing, and the resultant composite image is printed on the light or thermosetting resin film formed on the end face of the honeycomb structure, and then the end face of the honeycomb structure body Is irradiated with light or heat to cure the light or thermosetting resin film of a predetermined cell, and after the uncured light or thermosetting resin film is removed together with the plugging material, the cured light or thermosetting resin film A method for manufacturing a plugged honeycomb structure, wherein a plugged portion is formed by removing a plug. A plugged honeycomb in which a plugged portion is formed at one open end of a predetermined cell of a cylindrical honeycomb structure in which a plurality of cells serving as fluid flow paths are formed in a honeycomb shape by porous partition walls In the manufacturing method of the structure,
The plugging material contains light or thermosetting resin in advance, the plugging material is filled in all cells of the honeycomb structure, and the end face is determined based on the end face image information of the honeycomb structure captured in advance. An eye characterized by forming a plugging portion by irradiating a plugging pattern with a laser to cure the plugging material of a predetermined cell and removing the uncured plugging material. A method for manufacturing a sealed honeycomb structure. A plugged honeycomb in which a plugged portion is formed at one open end of a predetermined cell of a cylindrical honeycomb structure in which a plurality of cells serving as fluid flow paths are formed in a honeycomb shape by porous partition walls In the manufacturing method of the structure,
After filling all the cells on the end face of the honeycomb structure in advance with a plugging material, a light or thermosetting resin film is formed on the end face, and then the end face is determined based on the end face image information of the honeycomb structure taken in advance. By irradiating a laser in a plugging pattern, the light or thermosetting resin film of a predetermined cell is cured, and after the uncured light or thermosetting resin film is removed together with the plugging material, the cured light or A method for manufacturing a plugged honeycomb structure, wherein the plugged portion is formed by removing the thermosetting resin film.

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